QEOM
class QEOM(ground_state_solver, excitations='sd')
Bases: qiskit.chemistry.algorithms.excited_states_solvers.excited_states_solver.ExcitedStatesSolver
The calculation of excited states via the qEOM algorithm
Parameters
- ground_state_solver (
GroundStateSolver) – a GroundStateSolver object. The qEOM algorithm will use this ground state to compute the EOM matrix elements - excitations (
Union[str,List[List[int]]]) – The excitations to be included in the eom pseudo-eigenvalue problem. If a string (‘s’, ‘d’ or ‘sd’) then all excitations of the given type will be used. Otherwise a list of custom excitations can directly be provided.
Methods
solve
QEOM.solve(driver, aux_operators=None)
Run the excited-states calculation.
Construct and solves the EOM pseudo-eigenvalue problem to obtain the excitation energies and the excitation operators expansion coefficients.
Parameters
- driver (
BaseDriver) – a chemistry driver object which defines the chemical problem that is to be solved by this calculation. - aux_operators (
Union[List[FermionicOperator],List[BosonicOperator],None]) – Additional auxiliary operators to evaluate. Must be of typeFermionicOperatorif the qubit transformation is fermionic and of typeBosonicOperatorit is bosonic.
Return type
Union[ElectronicStructureResult, VibronicStructureResult]
Returns
The excited states result. In case of a fermionic problem a ElectronicStructureResult is returned and in the bosonic case a VibronicStructureResult.
Attributes
excitations
Returns the excitations to be included in the eom pseudo-eigenvalue problem.
Return type
Union[str, List[List[int]]]